AMERICAN DIPTERA. 55 



a brown line, in male merged in a single, light yellow, swollen mark- 

 ing. The small yellow sj^ot on the pteropleurje is very faint in the 

 female, wholly absent in the male ; scutellnm almost wholly yellow 

 in both ; yellow bands of second and thiixl segments hardly widened 

 laterally ; grayish pollinose lateral Innate markings of fonrth seg- 

 ment plain in female, only the ends apparent in the male ; hind 

 femora of male colored like the others, brownish ring of tibiae very 

 faint. Legs of female entirely ochraceous, bases of tibise yellow, 

 hind tarsi brownish , otherwise the specimens agree Avith Williston's 

 descriptions of the two sexes. 



These two specimens I believe to belong to the same species, and 

 are doubtless tridens Lw'., notwithstanding the above differences. 

 The second and third abdominal segments are of nearly equal length 

 in both. 



C Ol^TRIBFTIOIVS TO THE »IPTEROL,OGY OF 

 NORTH AMERICA. 



II.— TABANIDiE, CONOPID^, TACHINID.E, Etc. 



BY C. H. TYLER TOWNSEND. 



This paper is a continuation of the work begun in the first part, 

 which was on the Syrphidsp (Trans. Am. Ent. Soc. p. 33, 1895). The 

 jDresent and second part embraces the three families above mentioned, 

 and completes the author's notes and descriptions so far made on the 

 Townsend collection, which, as before stated, now forms a part of 

 the University of Kansas collection of North American Diptera. 

 Therefore all of the types herein described are to be found in that 

 collection, with the exception of a very few" recently acquired, and 

 which are duly noted. 



STRATIOMYID^. 



1. Pachygaster pulclier Lw. 



Las C'ruces, N. Mex. A female taken on foliage, May 5, proves 

 to be this species. Unlike the two female specimens from Montana, 

 mentioned by Williston in " Can. Ent." 1885, p. 128, it has the 

 femora blackish, except at base and tip. The front and third coxfe 

 are also black, except at tips. The short pubescence of mesoscutum 



TEANS. AM. ENT. SOC. XXII. MARCH, 1895. 



